For those drivers interested in entering, you can head to Garage Cartis, First Body Miyazato, or B&M Okinawa for more info and entry forms. All rounds at Yukari Bokujo (The Bullring).With Yukari Bokujo now shutdown, the location is undecided at this time. Basic info on the three classes:

Challenge Class, 8,000 yen = for those drivers just starting out; can’t link the full course and/or first competition

Beginner Class, 10,000 yen = drivers can link the course, but not ready for Expert Class